Keystones — Capstone
Five GCSE retrieval questions · 23 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² + 9x + 11
Answer: (x + 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 29cm, angle = 55°. Give your answer to 2 decimal places
Answer: 249.43cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 54:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 73, 46, 45, 41, 99, 15, 95
Answer: Mean = 62.5, Median = 59.5, Range = 84